not at all sure I'm not fighting some parallax. Nope, parallax isn't any different than the Mil scope marks - corrects for difference in optic bore center line and rifle bore center line. I've heard many times horiz. is below a node and vertical is above but doesn't make sense to me. For vertical, based on fps (1600-2400)
only and gravity drop. 200 fps diff. = 0.01" at the target. Even tripling the gravity fps (32*3 to simulate the vel. vector downward due to air resistance and changing BC) doesn't cause it.
Point is, large stringing is gun, shooter or setup.